Research Institute of Industrial Science & Technology

Posco Holdings Inc.

Posco Future M Co., Ltd.

Posco

Posco Co., Ltd

Hwang Yol Ryu

Ki Sung You

The present invention relates to a material injection scheduling method for producing a precursor having a concentration gradient using an apparatus for producing a precursor having a concentration gradient mixing materials of a first feed tank and a second feed tank with each other in advance in a mixer and injecting the mixed material into a reactor.

Apparatus for producing precursor having concentration gradient and material injection scheduling method therefor

A method for preparing a cathode active material precursor for a secondary battery, including: moving a co-precipitation filtrate generated after a co-precipitation reaction to a co-precipitation filtrate storage tank; removing a metal hydroxide by passing the co-precipitation filtrate through a filter; reacting the co-precipitation filtrate from which the metal hydroxide is removed with sulfuric acid or nitric acid to produce an ammonium sulfate or an ammonium nitrate while removing ammonia from the co-precipitation filtrate from which the metal hydroxide is removed; cooling and crystallizing the co-precipitation filtrate from which the metal hydroxide and ammonia are removed to precipitate a sodium sulfate; filtering the precipitated sodium sulfate to separate the precipitated sodium sulfate from the co-precipitation filtrate from which the metal hydroxide and ammonia are removed; drying the sodium sulfate separated from the co-precipitation filtrate and moving the co-precipitation filtrate separated from the sodium sulfate to a circulation concentration tank; and heating the co-precipitation filtrate stored in the circulation concentration tank to a predetermined temperature for recycling and performing Npurging or bubbling, is provided.

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Pohang-si, South Korea

Hwang Yol Ryu